$x^2-18+81$
$\left(\frac{1}{1+i}\right)^4$
$\int x\sqrt{16-9x^2}dx$
$x+7=10$
$\left(13-x^2\right)^2$
$\left(3a^6b^3+12\right)\left(3a^6b^3-11\right)$
$5x^2+40x+15$
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